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Edit File: README.Debian

Please check http://www.friedhoff.org/posixfilecaps.html to get more information on POSIX File Capabilities. Example: how to remove the SUID root bit from /bin/ping? -------------------------------------------------------- Make sure you have kernel 2.6.24 or newer you have CONFIG_SECURITY_CAPABILITIES and CONFIG_SECURITY_FILE_CAPABILITIES enabled. The Debian kernels are fine. $ ls -l /bin/ping -rwsr-xr-x 1 root root 30736 2007-01-31 00:10 /bin/ping ^ That is not good. $ sudo chmod 755 /bin/ping Or use dpkg-statoverride. $ ls -l /bin/ping -rwxr-xr-x 1 root root 30736 2007-01-31 00:10 /bin/ping That is better but ping fails. $ ping -c1 localhost ping: icmp open socket: Operation not permitted Now set the missing capability: $ sudo setcap cap_net_raw+ep /bin/ping ... and ping will work again. $ ping -c1 localhost PING localhost (127.0.0.1) 56(84) bytes of data. 64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.026 ms --- localhost ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.026/0.026/0.026/0.000 ms Torsten Werner